Black Diamond valves larger diameter than stock?

D

Douglass Harroun

Joined

Sep 12, 2008

Messages

131

• Oct 4, 2016

• #1

I've seen reference to Black Diamond Triumph valves being .060" larger diameter than stock-- is this true for Norton?
Thanks
Doug

 

comnoz

Joined

Dec 10, 2008

Messages

7,253

• Oct 4, 2016

• #2

Douglass Harroun said:

I've seen reference to Black Diamond Triumph valves being .060" larger diameter than stock-- is this true for Norton?
Thanks
Doug

Click to expand...

Black Diamond valves are available for a Norton in standard or .060 oversize.
.060 oversize valves will cause valve clash except with certain cams. Jim

 

A

APRRSV

VIP MEMBER

Joined

Jun 26, 2016

Messages

591

• Oct 5, 2016

• #3

Jim, are these the 1.5 mm oversize valves you use in your head mod? How do you deal with potential valve clash with your head mod?

Ed